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Deferred Tax - Schedule of Loss Carryforward Period and Deferred Corporate Income Tax Assets Not Recognized (Detail) - EUR (€)
€ in Millions
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets and liabilities [Line Items]    
Gross amounts € 613 € 490
Not recognized deferred tax asset 182 142
Less than 5 years [member]    
Deferred tax assets and liabilities [Line Items]    
Gross amounts 79 65
Not recognized deferred tax asset 20 15
Over 5 through 10 years [member]    
Deferred tax assets and liabilities [Line Items]    
Gross amounts 18 21
Not recognized deferred tax asset 4 5
Over 10 through 15 years [member]    
Deferred tax assets and liabilities [Line Items]    
Gross amounts 27 20
Not recognized deferred tax asset 51 36
Over 15 through 20 years [member]    
Deferred tax assets and liabilities [Line Items]    
Gross amounts 1  
Indefinitely [member]    
Deferred tax assets and liabilities [Line Items]    
Gross amounts 488 385
Not recognized deferred tax asset € 107 € 86